import cv2 as cv
import numpy as np


def main():
    img = np.ones((512, 512, 3), np.uint8) * 255

    center = (round(img.shape[1] / 2), round(img.shape[0] / 4))
    radius = 50
    color = (0, 0, 0)
    thickness = -1

    cv.circle(img, center, radius, color, thickness)
    cv.imshow("Press any key to exit", img)
    cv.waitKey(0)
    cv.destroyAllWindows()


if __name__ == "__main__":
    main()
